The left-hand operand of the?? Beginning with C 8. In particular, beginning with C 8. In expressions with the null-conditional operators?. When you work with nullable value types and need to provide a value of an underlying value type, use the?? GetValueOrDefault method if the value to be used when a nullable type value is null should be the default value of the underlying value type.
Beginning with C 7. The preceding example also demonstrates how to use expression-bodied members to define a property. If "a" is not evaluated as null, it returns the result of the evaluation of "a".
Otherwise, the expression in the right-hand operand, "b", is evaluated to obtain the result of the entire expression. For example, the null-coalescing operator can be used in a property of an object for returning a custom default value to avoid returning a null value.
The assignment of a nullable value type variable to a non-nullable type results in a compiler error, and the use of explicit cast for such an assignment can result in an exception. A null-coalescing operator is used in such assignments to avoid the compiler error and the exception. The operands used in the expression containing the null-coalescing operator must evaluate to a matching type or should be implicitly converted to a common type.
The operations in an expression that uses the null-coalescing operator are grouped from right to left. By: Brad Rudisail Contributor. By: Kaushik Pal Contributor. By: Leah Zitter Contributor.
Dictionary Dictionary Term of the Day. Decentralized Finance. Techopedia Terms. Or if the left-hand operand evaluates to non-null, then it does not evaluate its right-hand operand. Syntax: p?? The value of p can be nullable type, but the value of q must be non-nullable type. If the value of p is null, then it returns the value of q. Otherwise, it will return the value of p. Important Points: The?? You are not allowed to overload??
It is right-associative. You are allowed to use?? Skip to content. Change Language. Related Articles.
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